\documentclass{article}

\usepackage[margin=2cm]{geometry}
\usepackage[utf8]{inputenc}

\usepackage{amsmath}
\usepackage{amssymb}

\begin{document}

\include{2012-07-13}
\newpage
\include{2012-07-09}
\newpage
\include{2012-06-29}
\newpage
\include{2012-06-27}
\newpage
\include{2012-06-25}
\newpage
\include{2012-06-21}

\end{document}
